68636879 has 2 divisors, whose sum is σ = 68636880. Its totient is φ = 68636878.

The previous prime is 68636861. The next prime is 68636917. The reversal of 68636879 is 97863686.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68636879 - 2¹⁶ = 68571343 is a prime.

It is a super-2 number, since 2×68636879² = 9422042317721282, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68636879.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68636819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34318439 + 34318440.

It is an arithmetic number, because the mean of its divisors is an integer number (34318440).

Almost surely, 2^68636879 is an apocalyptic number.

68636879 is a deficient number, since it is larger than the sum of its proper divisors (1).

68636879 is an equidigital number, since it uses as much as digits as its factorization.

68636879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 53.

The square root of 68636879 is about 8284.7377146172. The cubic root of 68636879 is about 409.4358272492.

The spelling of 68636879 in words is "sixty-eight million, six hundred thirty-six thousand, eight hundred seventy-nine".